He followed the Constitution..not his personal beliefs. He did not think SCOTUS should be tenured legislators.
https://www.youtube.com/watch?v=x0FiMW4oVW8
I would not make it illegal (even though I despise it). So far the only think I know of that I disagree with Scalia on. And yet another thing to admire him for: He did what is right and constitutional, not what he preferred.